The spelling of the word "Acyterius" can be tricky to figure out without an understanding of its phonetic transcription. According to the IPA, the word is pronounced [əˈsɪtərɪəs]. The first syllable, "a" is pronounced with a schwa sound, while the "c" is pronounced as an "s." The second syllable contains the sound of the letter "i," followed by a "t" sound. In the third and fourth syllables, the "e" sound is pronounced as an "uh" sound, and "rius" is pronounced as "re-us." This transcription helps us determine the spelling of the word "Acyterius."